ACK: [PATCH trusty SRU] x86-64, modify_ldt: Make support for 16-bit segments a runtime option

[Stefan Bader]

Basically just adds an interface to re-configure the kernel to the old behaviour
of allowing 16bit segments (with the downside of having a potential information
leak).
From the stable discussion that I remember, running some Windows programs
through wine was one thing that still needed those.
Maybe it can be replaced by the proper fix they promise but then postponing it
till after the merge window re-opens sounds like it could be non-trivial.

-Stefan

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